Plastic mineral composition



UNITED I STATES PATENT OFFICE.

JOHN L. STEIVART AND JAMES L. HASTINGS, OF PHILADELPHIA, PENNSYL- VANIA,ASSIGNORS, BY MESNE ASSIGNMENTS, TO THE \VELSBACH INCAN- DESCENT GASLIGHT COMPANY, OF JERSEY CITY, NEIV JERSEY.

PLASTIC MINERAL COMPOSITION, 840.

SPECIFICATION forming part of Letters Patent No. 396,307, dated January15, 1889.

Application filed December 29 1885. Serial No. 187,000. (No specimens.)

To (z ZZ whom it may concern:

Be it known that we, JOHN L. STEWART and J AMES, L. HASTINGS, citizensof the United States, residing at Philadelphia, in the county ofPhiladelphia; State of Pennsylvania, have invented certain new anduseful Improvements in Plastic Mineral Compositions and Vitreous orCrystalline Compounds, of which the following is a specification.

This invention relates to a new plastic mineral composition and vitreousor crystalline compound for use in chemical and other arts and forincandescent illumination, said composition being adapted for moldinginto articles of various forms and for coaiin g metallic and otherarticles to protect them from the oxidizing and corroding influences ofair, moisture, acids, &c., and from injury by heat. The plasticcompound, when properly burned or fired, is highly refractory, veryhard, crystalline in structure, rough on the surface, white oropalescent, and practically infusible.

The object of the invention is to produce a readily-incandescingcompound capable of resisting the action of intense heat, andparticularly adapted for forming incandescent burners or attachments forburners for illumination with coal-gas, water-gas, or natural gas.

The plastic compound is formed of a mixture of ingredients in about thefollowing proportions: magnesia oxide or carbonate, four hundred andthirty-eight grains; strontia oxide, (caustic,) three hundred andfortytwo grains; strontia carbonate, ninety grains; strontia sulphate,ninety grains; calcium oxide or carbonate, two hundred and eight grains;glucinium oxide or carbonate, twentyfour grains; fluor-spar, as a flux,two hundred and thirty grains.

Zirconium oxide, twenty grains, may be substituted for the gluciniumoxide or carbonate, or may be added to the compound, as above stated.

The materials are ground dry or in oil or water or glycerine, and theresulting pulverized material isintimately mixed in glycerine or itsequivalent to the proper consistency for convenient handling orapplication. The

mixture of ingredients having been properly 5o effected, the compound ismolded into the desired articles or coated upon articles of metal orother material, and in such forms is subjected to a suitable temperatureto drive off the moisture or volatile matter and then to a hightemperature in a gas or other furnace, and may afterward be suspended ina gas flame or placed in burning gas in the open air for completing theprocess of burning and for testing and proving the finished articles.

The proportions of mineral ingredients above mentioned for forming thecompound and various forms of burner attachments for illumination withgas give satisfactory re sults; but we do not limit ourselves to theproportions stated, as other proportions will give good results, andthey may be varied without departing from our invention.

It is to be noted that the mineral ingredients may be pulverized in thedry condition and the glycerine or the hydrocarbon or other oilafterward added.

Having described our invention, what We claim, and desire to secure byLetters Patent,

1. A composition for forming a refractory compound, consisting ofmagnesia oxide or carbonate, strontia oxide, strontia carbonate,strontia sulphate, calcium oxide or carbonate, glucinium oxide orcarbonate with or without zirconium oxide, fiuor-spar as a flux, and asuitable moistening-fiuid.

2. A refractory crystalline compound composed of magnesia oxide orcarbonate, strontia oxide, strontia carbonate, strontia sulphate,calcium oxide or carbonate, glucinium oxide or carbonate with or withoutzirconium oxide, and flnor-spar as a flux, said compound being white oropalescent, rough on the surface, and practically infusible.

In testimony whereof we affix our signatures in presence of twowitnesses.

JOHN L. STEWVART. JAMES L. HASTINGS.

Vitnesses:

CHAS. MATHEWS, J r., FRED. ScHUE.

